I have twin 115 four strokes with 160 hours. The port side engine would not go above 4200 RPM yesterday (5400 WOT). In neutral the engine idled fine and ran smoothly up through the RPM range. Under load the engine ran poorly. <br /><br />I run ringfree religiously.<br /><br />I have had all the service done on these engines.<br /><br />Any help?
